Magic Open House is a Wizards Play Network event planned on the Saturday before each set's Prerelease. It was introduced for the Amonkhet release on Saturday, April 15, 2017. This new event encourages casual fun for new players and easy, league-style Standard play with a Welcome Deck and a participation promo reward.
Starting with Ixalan, a Full-art Ixalan promo preview card was given.
Magic Open House Ixalan promotional kit
What's in Store for In-Store Play, News
So Much Amonkhet News, News
In-Store Play Evolves, Feature Article
Ixalan Promos, Planeswalker Decks, Packaging, and FNM Tokens!, Card Preview